<template>
  <view v-if="isShow" ref="ani" :class="[ani.in]" :style="transformStyles" class="tui-popup__transition"
        @click="change">
    <slot></slot>
  </view>
</template>

<script>
// #ifdef APP-NVUE
const animation = uni.requireNativePlugin('animation');
// #endif

export default {
  name: 'tuiPopup',
  emits: ['click', 'change'],
  props: {
    show: {
      type: Boolean,
      default: false
    },
    /*
      [fade|slide-top|slide-right|slide-bottom|slide-left|zoom-in|zoom-out]
      过渡动画类型
    */

    modeClass: {
      type: Array,
      default() {
        return [];
      }
    },
    duration: {
      type: Number,
      default: 300
    },
    //styles 组件样式，同 css 样式
    styles: {
      type: Object,
      default() {
        return {};
      }
    }
  },
  data() {
    return {
      isShow: false,
      transform: '',
      ani: {
        in: '',
        active: ''
      }
    };
  },
  watch: {
    show: {
      handler(newVal) {
        if (newVal) {
          this.open();
        } else {
          this.isShow && this.close();
        }
      },
      immediate: true
    }
  },
  computed: {
    stylesObject() {
      const ani = {
        position: 'fixed',
        bottom: 0,
        top: 0,
        left: 0,
        right: 0,
        /* #ifndef APP-NVUE */
        display: 'flex',
        /* #endif */
        'justify-content': 'center',
        'align-items': 'center'
      }
      const aniStyles = Object.assign({}, ani, this.styles);
      let styles = {
        ...aniStyles,
        'transition-duration': this.duration / 1000 + 's'
      };
      let transfrom = '';
      for (let i in styles) {
        let line = this.toLine(i);
        transfrom += line + ':' + styles[i] + ';';
      }
      return transfrom;
    },
    transformStyles() {
      return `transform:${this.transform};${this.stylesObject}`
    }
  },
  methods: {
    change() {
      this.$emit('click', {
        detail: this.isShow
      });
    },
    open() {
      clearTimeout(this.timer);
      this.isShow = true;
      this.transform = '';
      this.ani.in = '';
      for (let i in this.getTranfrom(false)) {
        if (i === 'opacity') {
          this.ani.in = 'fade-in';
        } else {
          this.transform += `${this.getTranfrom(false)[i]} `;
        }
      }
      this.$nextTick(() => {
        setTimeout(() => {
          this._animation(true);
        }, 50);
      });
    },
    close(type) {
      clearTimeout(this.timer);
      this._animation(false);
    },
    _animation(type) {
      let styles = this.getTranfrom(type);
      // #ifdef APP-NVUE
      if (!this.$refs['ani']) return;
      animation.transition(
          this.$refs['ani'].ref, {
            styles,
            duration: this.duration, //ms
            timingFunction: 'ease',
            needLayout: false,
            delay: 0 //ms
          },
          () => {
            if (!type) {
              this.isShow = false;
            }
            this.$emit('change', {
              detail: this.isShow
            });
          }
      );
      // #endif
      // #ifndef APP-NVUE
      this.transform = '';
      for (let i in styles) {
        if (i === 'opacity') {
          this.ani.in = `fade-${type ? 'out' : 'in'}`;
        } else {
          this.transform += `${styles[i]} `;
        }
      }
      this.timer = setTimeout(() => {
        if (!type) {
          this.isShow = false;
        }
        this.$emit('change', {
          detail: this.isShow
        });
      }, this.duration);
      // #endif
    },
    getTranfrom(type) {
      let styles = {
        transform: ''
      };
      this.modeClass.forEach(mode => {
        switch (mode) {
          case 'fade':
            styles.opacity = type ? 1 : 0;
            break;
          case 'slide-top':
            styles.transform += `translateY(${type ? '0' : '-100%'}) `;
            break;
          case 'slide-right':
            styles.transform += `translateX(${type ? '0' : '100%'}) `;
            break;
          case 'slide-bottom':
            styles.transform += `translateY(${type ? '0' : '100%'}) `;
            break;
          case 'slide-left':
            styles.transform += `translateX(${type ? '0' : '-100%'}) `;
            break;
          case 'zoom-in':
            styles.transform += `scale(${type ? 1 : 0.8}) `;
            break;
          case 'zoom-out':
            styles.transform += `scale(${type ? 1 : 1.2}) `;
            break;
        }
      });
      return styles;
    },
    _modeClassArr(type) {
      let mode = this.modeClass;
      if (typeof mode !== 'string') {
        let modestr = '';
        mode.forEach(item => {
          modestr += item + '-' + type + ',';
        });
        return modestr.substr(0, modestr.length - 1);
      } else {
        return mode + '-' + type;
      }
    },
    toLine(name) {
      return name.replace(/([A-Z])/g, '-$1').toLowerCase();
    }
  }
};
</script>

<style scoped>
.tui-popup__transition {
  transition-timing-function: ease;
  transition-duration: 0.3s;
  transition-property: transform, opacity;
  position: relative;
  z-index: 99;
}

.fade-in {
  opacity: 0;
}

.fade-out {
  opacity: 1;
}

.slide-top-in {
  transform: translateY(-100%);
}

.slide-top-active {
  transform: translateY(0);
}

.slide-right-in {
  transform: translateX(100%);
}

.slide-right-active {
  transform: translateX(0);
}

.slide-bottom-in {
  transform: translateY(100%);
}

.slide-bottom-active {
  transform: translateY(0);
}

.slide-left-in {
  transform: translateX(-100%);
}

.slide-left-active {
  transform: translateX(0);
  opacity: 1;
}

.zoom-in-in {
  transform: scale(0.8);
}

.zoom-out-active {
  transform: scale(1);
}

.zoom-out-in {
  transform: scale(1.2);
}
</style>
